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V in (-oo:+oo)
(1/4)*V^2-(9/16) = 0
(1/4)*V^2-9/16 = 0
1/4*V^2 = 9/16 // : 1/4
V^2 = 9/4
V^2 = 9/4 // ^ 1/2
abs(V) = 3/2
V = 3/2 or V = -3/2
V in { 3/2, -3/2 }
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